Carrier AquaSnap 30MPA Series Controls, Start-up, Operation, Service, And Troubleshooting

Also see for AQUASNAP 30MPA: User manual Operation and service manual Installation instructions

Carrier AquaSnap 30MPA Series Controls, Start-up, Operation, Service, And Troubleshooting Manual pdf 45 page image

454. Remove the four nuts holding the heat exchanger to thebrackets. Save the nuts.5. Install the replacement heat exchanger in the unit and at-tach to the bracket using the four nuts removed in Step 4.For sizes 015 and 020, torque is 7 to 10 ft-lb. For sizes030-045, torque is 35 to 50 ft-lb. For sizes 050-071,torque is 10 to 11 ft-lb.6. Carefully braze the refrigerant lines to the connections onthe heat exchanger. Lines should be soldered using silveras the soldering material with a minimum of 45% silver.Keep the temperature below 1472 F (800 C) under nor-mal soldering conditions (no vacuum) to prevent the cop-per solder of the brazed plate heat exchanger from chang-ing its structure. Failure to do so can result in internalor external leakage at the connections which cannot berepaired.7. For coolers, ensure that the original size tubing is used(1/2 in. for sizes 015 and 020, 5/8 in. for sizes 030-045, and13/8 in. for sizes 050-071) between the TXV/EXV or ex-pansion device and the cooler. The TXV/EXV or expan-sion device must be located within 1 ft of the heat ex-changer, with no bends between the TXV/EXV or expan-sion device outlet and the cooler inlet.8. Reconnect the water/brine lines.9. Dehydrate and recharge the unit. Check for leaks.BRAZED-PLATE COOLER AND CONDENSER HEATEXCHANGER CLEANING — Brazed-plate heat exchang-ers must be cleaned chemically. A professional cleaning ser-vice skilled in chemical cleaning should be used. Use a weakacid (5% phosphoric acid, or if the heat exchanger is cleanedfrequently, 5% oxalic acid). Pump the cleaning solutionthrough the exchanger, preferably in a backflush mode. Aftercleaning, rinse with large amounts of fresh water to dispose ofall the acid. Cleaning materials must be disposed of properly.The strainers in front of the water/brine inlets of the heat ex-changers should be cleaned periodically, depending oncondition of the chiller water/brine.Water Treatment — Untreated or improperly treatedwater may result in corrosion, scaling, erosion, or algae. Theservices of a qualified water treatment specialist should be ob-tained to develop and monitor a treatment program. See watersystem cleaning section for water quality characteristics andlimitations in the unit installation instructions.Oil ChargePuron refrigerant systems use a polyol ester (POE) oil for30MP015-045 units. The 30MP050-071 units use polyvinylester (PVE) oil. See Table 43.Table 43 — Compressor OilsUse only Carrier approved compressor oil. Oil should bevisible in compressor oil sight glass. An acceptable oil level isfrom 1/8 to 3/8 of sight glass. All compressors must be off whenchecking oil level. Recommended oil level adjustment methodis as follows:ADD OIL — Additional oil may be required in 30MPA units.Tables 37 and 38 provide an estimate of the amount of oil re-quired, based on the line length and the recommended pipe siz-es. The actual circuit oil charge will depend on the applicationpiping. The guidelines listed are estimates and will likely needadjusting depending on the number of traps in the applicationand the pipe sizes utilized.No attempt should be made to increase the oil level in thesight-glass above the 3/4 full level. A high oil level is not sus-tainable in the compressor and the extra oil will be pumped outinto the system causing a reduction in system efficiency and ahigher-than-normal oil circulation rate.Add oil to suction line Schrader valve on tandem compres-sors sets and the compressor Schrader on the trios. When oilcan be seen at the bottom of the sight glass, add oil in 5 oz in-crements which is approximately 1/8 in oil level. Run all com-pressors for 20 minutes then shut off to check oil level. Repeatprocedure until acceptable oil level is present.NOTE: Use only Carrier approved compressor oil. Approvedsources for 30MP015-045 units are:Totaline . . . . . . . . . . . . . . . . . . . . . . 3MAF POE, P903-1601Mobil. . . . . . . . . . . . . . . . . . . . . . . . . . . EAL Arctic 32-3MAUniqema . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RL32-3MAFThe approved source for 30MP050-071 units is:Totaline . . . . . . . . . . . . . . . . . . . . . . . . FVC32D, P903-2501Do not reuse oil that has been drained out, or oil that hasbeen exposed to atmosphere.Check Refrigerant Feed ComponentsFILTER DRIER — The function of the filter drier is to main-tain a clean, dry system. The moisture indicator (describedbelow) indicates any need to change the filter drier. The filterdrier is a sealed-type drier for 30MP015-045 and removeablecore for 30MP050-071. When the drier needs to be changed,the entire filter drier must be replaced for 30MP015-045 units.MOISTURE-LIQUID INDICATOR — The indicator islocated immediately ahead of the TXV to provide an indicationof the refrigerant moisture content. It also provides a sight glassfor refrigerant liquid. Clear flow of liquid refrigerant (at full unitloading) indicates sufficient charge in the system. Bubbles in thesight glass (at full unit loading) indicate an undercharged systemor the presence of noncondensables. Moisture in the system,measured in parts per million (ppm), changes the color of theindicator as follows:Green (safe) —Moisture is below 75 ppmYellow-Green (caution) — 75 to 150 ppmYellow (wet) — above 150 ppmThe unit must be in operation at least 12 hours before themoisture indicator gives an accurate reading, and must be incontact with liquid refrigerant. At the first sign of moisture inthe system, change the corresponding filter drier.THERMOSTATIC EXPANSION VALVE (TXV)(30MP015-045 ONLY) — The TXV controls the flow ofliquid refrigerant to the cooler by maintaining constant super-heat of vapor leaving the cooler. The valve is activated by atemperature-sensing bulb strapped to the suction line.CAUTIONWater must be within design flow limits, clean and treatedto ensure proper machine performance and reduce thepotential of tubing damage due to corrosion, scaling,erosion, and algae. Carrier assumes no responsibility forchiller or condenser damage resulting from untreated orimproperly treated water.CAUTIONThe compressor in a Puron® refrigerant (R-410A) systemuses a polyol ester (POE) oil or poly vinyl ester (PVE) oil.This is extremely hygroscopic, meaning it absorbs waterreadily. Take all necessary precautions to avoid exposure ofthe oil to the atmosphere. Failure to do so could result inpossible equipment damage.30MP UNIT SIZE OIL015-045 POE 3MAF050-071 PVE FVC32D